Concept:
Byzantine architecture developed in the Eastern Roman Empire and is known for:
• Massive domes
• Use of pendentives
• Rich mosaics
• Centralized church plans
Many Byzantine churches became iconic examples of early Christian and Eastern Roman architecture.
Step 1: Analyze St. Peter's Church.
St. Peter's Basilica is mainly associated with Renaissance and Baroque architecture in Vatican City.
Hence, statement A is incorrect.
Step 2: Analyze Riccardi Palace.
Riccardi Palace is a Renaissance building located in Florence, Italy.
Hence, statement B is incorrect.
Step 3: Analyze Hagia Sofia.
Hagia Sofia (Hagia Sophia) in Constantinople is one of the greatest examples of Byzantine architecture.
Hence, statement C is correct.
Step 4: Analyze Alhambara.
Alhambara is a famous example of Islamic Moorish architecture in Spain.
Hence, statement D is incorrect.
Step 5: Analyze St. Sergius Church.
The Church of Saints Sergius and Bacchus is an important Byzantine architectural structure.
Hence, statement E is correct.
Step 6: Choose the correct option.
Structures belonging to Byzantine architecture are:
\[
\text{Hagia Sofia and St. Sergius Church}
\]
Therefore, the correct answer is:
\[
{\text{(D) C and E only}}
\]